mirror of https://gitee.com/bigwinds/arangodb
199 lines
8.1 KiB
Markdown
199 lines
8.1 KiB
Markdown
////////////////////////////////////////////////////////////////////////////////
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/// @startDocuBlock REST_DOCUMENT_UPDATE
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/// @brief updates a document
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///
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/// @RESTHEADER{PATCH /_api/document/{document-handle},Update document}
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///
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/// @RESTALLBODYPARAM{document,json,required}
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/// A JSON representation of a document update as an object.
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///
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/// @RESTURLPARAMETERS
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///
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/// @RESTURLPARAM{document-handle,string,required}
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/// This URL parameter must be a document handle.
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///
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/// @RESTQUERYPARAMETERS
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///
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/// @RESTQUERYPARAM{keepNull,boolean,optional}
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/// If the intention is to delete existing attributes with the patch
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/// command, the URL query parameter *keepNull* can be used with a value
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/// of *false*. This will modify the behavior of the patch command to
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/// remove any attributes from the existing document that are contained
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/// in the patch document with an attribute value of *null*.
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///
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/// @RESTQUERYPARAM{mergeObjects,boolean,optional}
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/// Controls whether objects (not arrays) will be merged if present in
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/// both the existing and the patch document. If set to *false*, the
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/// value in the patch document will overwrite the existing document's
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/// value. If set to *true*, objects will be merged. The default is
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/// *true*.
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///
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/// @RESTQUERYPARAM{waitForSync,boolean,optional}
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/// Wait until document has been synced to disk.
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///
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/// @RESTQUERYPARAM{ignoreRevs,boolean,optional}
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/// By default, or if this is set to *true*, the *_rev* attributes in
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/// the given document is ignored. If this is set to *false*, then
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/// the *_rev* attribute given in the body document is taken as a
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/// precondition. The document is only updated if the current revision
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/// is the one specified.
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///
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/// @RESTQUERYPARAM{returnOld,boolean,optional}
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/// Return additionally the complete previous revision of the changed
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/// document under the attribute *old* in the result.
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///
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/// @RESTQUERYPARAM{returnNew,boolean,optional}
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/// Return additionally the complete new document under the attribute *new*
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/// in the result.
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///
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/// @RESTHEADERPARAMETERS
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///
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/// @RESTHEADERPARAM{If-Match,string,optional}
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/// You can conditionally update a document based on a target revision id by
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/// using the *if-match* HTTP header.
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///
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/// @RESTDESCRIPTION
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/// Partially updates the document identified by *document-handle*.
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/// The body of the request must contain a JSON document with the
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/// attributes to patch (the patch document). All attributes from the
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/// patch document will be added to the existing document if they do not
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/// yet exist, and overwritten in the existing document if they do exist
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/// there.
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///
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/// Setting an attribute value to *null* in the patch document will cause a
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/// value of *null* to be saved for the attribute by default.
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///
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/// If the *If-Match* header is specified and the revision of the
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/// document in the database is unequal to the given revision, the
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/// precondition is violated.
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///
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/// If *If-Match* is not given and *ignoreRevs* is *false* and there
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/// is a *_rev* attribute in the body and its value does not match
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/// the revision of the document in the database, the precondition is
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/// violated.
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///
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/// If a precondition is violated, an *HTTP 412* is returned.
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///
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/// If the document exists and can be updated, then an *HTTP 201* or
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/// an *HTTP 202* is returned (depending on *waitForSync*, see below),
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/// the *ETag* header field contains the new revision of the document
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/// and the *Location* header contains a complete URL under which the
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/// document can be queried.
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///
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/// Optionally, the query parameter *waitForSync* can be used to force
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/// synchronization of the updated document operation to disk even in case
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/// that the *waitForSync* flag had been disabled for the entire collection.
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/// Thus, the *waitForSync* query parameter can be used to force synchronization
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/// of just specific operations. To use this, set the *waitForSync* parameter
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/// to *true*. If the *waitForSync* parameter is not specified or set to
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/// *false*, then the collection's default *waitForSync* behavior is
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/// applied. The *waitForSync* query parameter cannot be used to disable
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/// synchronization for collections that have a default *waitForSync* value
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/// of *true*.
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///
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/// The body of the response contains a JSON object with the information
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/// about the handle and the revision. The attribute *_id* contains the
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/// known *document-handle* of the updated document, *_key* contains the
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/// key which uniquely identifies a document in a given collection, and
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/// the attribute *_rev* contains the new document revision.
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///
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/// If the query parameter *returnOld* is *true*, then
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/// the complete previous revision of the document
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/// is returned under the *old* attribute in the result.
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///
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/// If the query parameter *returnNew* is *true*, then
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/// the complete new document is returned under
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/// the *new* attribute in the result.
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///
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/// If the document does not exist, then a *HTTP 404* is returned and the
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/// body of the response contains an error document.
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///
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/// @RESTRETURNCODES
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///
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/// @RESTRETURNCODE{201}
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/// is returned if the document was updated successfully and
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/// *waitForSync* was *true*.
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///
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/// @RESTRETURNCODE{202}
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/// is returned if the document was updated successfully and
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/// *waitForSync* was *false*.
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///
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/// @RESTRETURNCODE{400}
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/// is returned if the body does not contain a valid JSON representation
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/// of a document. The response body contains
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/// an error document in this case.
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///
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/// @RESTRETURNCODE{404}
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/// is returned if the collection or the document was not found.
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///
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/// @RESTRETURNCODE{412}
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/// is returned if the precondition was violated. The response will
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/// also contain the found documents' current revisions in the *_rev*
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/// attributes. Additionally, the attributes *_id* and *_key* will be
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/// returned.
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///
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/// @EXAMPLES
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///
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/// Patches an existing document with new content.
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///
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/// @EXAMPLE_ARANGOSH_RUN{RestDocumentHandlerPatchDocument}
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/// var cn = "products";
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/// db._drop(cn);
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/// db._create(cn);
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///
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/// var document = db.products.save({"one":"world"});
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/// var url = "/_api/document/" + document._id;
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///
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/// var response = logCurlRequest("PATCH", url, { "hello": "world" });
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///
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/// assert(response.code === 202);
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///
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/// logJsonResponse(response);
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/// var response2 = logCurlRequest("PATCH", url, { "numbers": { "one": 1, "two": 2, "three": 3, "empty": null } });
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/// assert(response2.code === 202);
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/// logJsonResponse(response2);
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/// var response3 = logCurlRequest("GET", url);
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/// assert(response3.code === 200);
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/// logJsonResponse(response3);
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/// var response4 = logCurlRequest("PATCH", url + "?keepNull=false", { "hello": null, "numbers": { "four": 4 } });
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/// assert(response4.code === 202);
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/// logJsonResponse(response4);
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/// var response5 = logCurlRequest("GET", url);
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/// assert(response5.code === 200);
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/// logJsonResponse(response5);
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/// ~ db._drop(cn);
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/// @END_EXAMPLE_ARANGOSH_RUN
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///
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/// Merging attributes of an object using `mergeObjects`:
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///
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/// @EXAMPLE_ARANGOSH_RUN{RestDocumentHandlerPatchDocumentMerge}
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/// var cn = "products";
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/// db._drop(cn);
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/// db._create(cn);
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///
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/// var document = db.products.save({"inhabitants":{"china":1366980000,"india":1263590000,"usa":319220000}});
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/// var url = "/_api/document/" + document._id;
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///
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/// var response = logCurlRequest("GET", url);
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/// assert(response.code === 200);
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/// logJsonResponse(response);
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///
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/// var response = logCurlRequest("PATCH", url + "?mergeObjects=true", { "inhabitants": {"indonesia":252164800,"brazil":203553000 }});
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/// assert(response.code === 202);
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///
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/// var response2 = logCurlRequest("GET", url);
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/// assert(response2.code === 200);
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/// logJsonResponse(response2);
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///
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/// var response3 = logCurlRequest("PATCH", url + "?mergeObjects=false", { "inhabitants": { "pakistan":188346000 }});
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/// assert(response3.code === 202);
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/// logJsonResponse(response3);
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///
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/// var response4 = logCurlRequest("GET", url);
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/// assert(response4.code === 200);
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/// logJsonResponse(response4);
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/// ~ db._drop(cn);
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/// @END_EXAMPLE_ARANGOSH_RUN
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/// @endDocuBlock
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////////////////////////////////////////////////////////////////////////////////
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